I can see that self-driving in rural areas might be less of a challenge, but what happens when such a vehicle hits a town? Does it drive anyway or does it stop

I can see that self-driving in rural areas might be less of a challenge, but what happens when such a vehicle hits a town? Does it drive anyway or does it stop in a pre-assigned parking area? That's a logistical and financial burden for both the company providing the vehicle and anyone using it. While figuring out how to get self-driving cars to work, there are problems beyond just the self-driving that involve a lot of staff. Examples: - Supervised training drives - Rescuing stuck cars - Maintaining & refueling the cars I imagine those efforts are easier to scale when concentrated in a large, dense urban environment.